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脐血流ri多少是正常值

更新时间: 2020-11-05 00:00:00     

脐血流正常值跟怀孕的周数有关,大多以晚期妊娠时数值小于或者等于3.0为正常值,随着妊娠时间的推移呈降低趋势,28周以后,RI应该小于0.8。

脐血流是指通过脐动脉收缩期最高血流速度与舒展期最低血流速度的比值、阴力指数与搏动指数等指标来反应血流情况。检查脐血流是为了判断胎儿在宫内的发育情况,判断是否有妊娠期高血压综合征发生的倾向。

关键词: 血流 ri 多少 正常值

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